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Residential Whole Loans - Residential Whole Loans, at Carrying Value Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV ratio (as a percent)	80.00%
Loans	$ 1,550,234
Residential Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, fair value	103,700
Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	843,883
Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	35,467
Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	172,213
Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 68,945
Multi-Family Transitional Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average Term to Maturity (Months)	14 months	18 months
Weighted Average LTV ratio (as a percent)	63.00%	64.00%
Loans	$ 1,200,000	$ 632,300
Settled Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	7,814,106	6,273,743
Unpaid Principal Balance (“UPB”)	$ 8,175,387	$ 6,741,786
Weighted Average Coupon (as a percent)	6.86%	5.78%
Weighted Average Term to Maturity (Months)	240 months	271 months
60+ Delinquency %	3.80%	3.10%
Settled Whole Loans | Non-QM loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	$ 3,700,052	$ 3,352,471
Unpaid Principal Balance (“UPB”)	$ 3,934,798	$ 3,671,468
Weighted Average Coupon (as a percent)	5.78%	5.13%
Weighted Average Term to Maturity (Months)	344 months	351 months
Weighted Average LTV ratio (as a percent)	65.00%	65.00%
Weighted Average FICO Scores	735	733
60+ Delinquency %	2.70%	2.60%
Settled Whole Loans | Non-QM loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 3,732,327	$ 3,520,671
Settled Whole Loans | Non-QM loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	98,017	56,825
Settled Whole Loans | Non-QM loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	29,587	32,253
Settled Whole Loans | Non-QM loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	74,867	61,719
Settled Whole Loans | Transitional loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	2,358,909	1,411,997
Unpaid Principal Balance (“UPB”)	$ 2,368,121	$ 1,431,692
Weighted Average Coupon (as a percent)	9.22%	7.78%
Weighted Average Term to Maturity (Months)	10 months	12 months
Weighted Average LTV ratio (as a percent)	64.00%	66.00%
Weighted Average FICO Scores	747	746
60+ Delinquency %	5.10%	5.30%
Settled Whole Loans | Transitional loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 2,187,161	$ 1,348,815
Settled Whole Loans | Transitional loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	61,024	6,463
Settled Whole Loans | Transitional loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	26,618	2,234
Settled Whole Loans | Transitional loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	93,318	74,180
Settled Whole Loans | Single-family rental loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	1,630,442	1,375,297
Unpaid Principal Balance (“UPB”)	$ 1,729,923	$ 1,485,967
Weighted Average Coupon (as a percent)	6.30%	5.74%
Weighted Average Term to Maturity (Months)	320 months	324 months
Weighted Average LTV ratio (as a percent)	70.00%	69.00%
Weighted Average FICO Scores	738	737
60+ Delinquency %	4.70%	2.40%
Settled Whole Loans | Single-family rental loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 1,636,810	$ 1,442,095
Settled Whole Loans | Single-family rental loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	12,543	8,431
Settled Whole Loans | Single-family rental loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	12,314	7,978
Settled Whole Loans | Single-family rental loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	68,256	27,463
Settled Whole Loans | Seasoned performing loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	68,924	82,884
Unpaid Principal Balance (“UPB”)	$ 75,715	$ 90,843
Weighted Average Coupon (as a percent)	4.58%	3.31%
Weighted Average Term to Maturity (Months)	143 months	151 months
Weighted Average LTV ratio (as a percent)	28.00%	30.00%
Weighted Average FICO Scores	725	714
60+ Delinquency %	3.40%	5.90%
Settled Whole Loans | Seasoned performing loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 72,126	$ 84,514
Settled Whole Loans | Seasoned performing loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	1,045	993
Settled Whole Loans | Seasoned performing loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	235	937
Settled Whole Loans | Seasoned performing loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	2,309	4,399
Settled Whole Loans | Agency eligible investor loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	55,779	51,094
Unpaid Principal Balance (“UPB”)	$ 66,830	$ 61,816
Weighted Average Coupon (as a percent)	3.44%	3.44%
Weighted Average Term to Maturity (Months)	332 months	344 months
Weighted Average LTV ratio (as a percent)	66.00%	68.00%
Weighted Average FICO Scores	758	757
60+ Delinquency %	0.30%	0.00%
Settled Whole Loans | Agency eligible investor loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 65,094	$ 61,816
Settled Whole Loans | Agency eligible investor loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	1,508	0
Settled Whole Loans | Agency eligible investor loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	0	0
Settled Whole Loans | Agency eligible investor loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	228	0
Settled Whole Loans | Purchased Credit Deteriorated Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	418,109	448,887
Unpaid Principal Balance (“UPB”)	$ 506,828	$ 554,907
Weighted Average Coupon (as a percent)	4.83%	4.66%
Weighted Average Term to Maturity (Months)	267 months	277 months
Weighted Average LTV ratio (as a percent)	59.00%	63.00%
60+ Delinquency %	16.20%	18.70%
Settled Whole Loans | Purchased Credit Deteriorated Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 379,970	$ 403,042
Settled Whole Loans | Purchased Credit Deteriorated Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	44,731	48,107
Settled Whole Loans | Purchased Credit Deteriorated Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	12,814	16,270
Settled Whole Loans | Purchased Credit Deteriorated Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	69,313	87,488
Settled Whole Loans | Purchased Non-performing Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	705,424	796,109
Unpaid Principal Balance (“UPB”)	$ 772,737	$ 884,257
Weighted Average Coupon (as a percent)	5.21%	5.01%
Weighted Average Term to Maturity (Months)	270 months	277 months
Weighted Average LTV ratio (as a percent)	62.00%	68.00%
60+ Delinquency %	30.00%	39.60%
Settled Whole Loans | Purchased Non-performing Loans | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	$ 444,491	$ 444,045
Settled Whole Loans | Purchased Non-performing Loans | 30-59
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	96,464	89,623
Settled Whole Loans | Purchased Non-performing Loans | 60-89
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	31,560	40,554
Settled Whole Loans | Purchased Non-performing Loans | 90 or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Aging by UPB	200,222	310,035
Settled Whole Loans | Residential Whole Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Fair Value / Carrying Value	8,937,639	7,518,739
Unpaid Principal Balance (“UPB”)	$ 9,454,952	$ 8,180,950
Weighted Average Coupon (as a percent)	6.04%	5.64%
Weighted Average Term to Maturity (Months)	234 months	272 months
60+ Delinquency %	6.60%	8.10%
Settled Whole Loans | Certain transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Weighted Average LTV ratio (as a percent)	68.00%	70.00%
Residential Transition Loans | Certain transition loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Securitization of eligible investor loans	$ 551,300	$ 223,200

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